Apple's not gonna like this one, but news of the perpetual cat-and-mouse game between it and the hacking community continues with the announcement of an untethered jailbreak for iOS 5.1, which is now alive and kicking on the iPhone 4. The good news went out in the form of a tweet from pod2g, and while the naughty bit of software isn't yet available for public download, we can only hope that it'll soon be ready for mass consumption. As you'll recall, we last saw hints of an untethered jailbreak for the latest iPad (also iOS 5.1), which similarly remains elusive to the public. At any rate, we welcome the progress -- now bring on the exploits.